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CHECKING CRANKSHAFT AND
CONNECTING ROD
After having checked the state of wear of
the coupling surfaces, check the offset of
the half shaft axes by placing the crankshaft
in between two tailstocks or similar instru-
ment. Control the maximum measurement
variation during a complete turn, using
comparators positioned on the coupling
surfaces with the crankshaft bearings.
Allowed limited: 0.12mm
Check the axial play between the connec-
ting rod head and the half shafts.
Recommended play:
0.4÷0.7mm
Check the radial play of the connecting rod
head bearing placing the crankshaft on a
stable support, with the axis of the connec-
ting rod inclined about 45° respect to the
horizontal position. Then position a com-
parator in axis and, pressing lightly in the
direction of the crank lever, check that the
measurement detected does not exceed the
service limit.
Maximum play 0.05mm
If play is greater replace the connecting rod.
Deflection/Off-centring of crankshaft.
Connecting rod axial play.
Connecting rod radial play.
2
.2
~45°
